- Gender: Male
- Age: ???
- Hair: Brown
- Eyes: Black
- Nationality: Japanese
- From the anime series Blue Seed, property of AD Vision and Yuzo Takada
- First Appearance: Chapter 9
A former computer expert for the Japanese government before being transferred to the TAC, Yaegashi fills the role of information specialist. He is, in fact, very good at this, and is frequently working on new programs at the absolute cutting edge of computer technology, some of which are even applicable to his job!
Yaegashi is, well, to put it bluntly, a geek. And a bit of a pervert. He has little social life, still lives with his mother, is a fan of anime and idol singers, and used a ostensibly TAC-related computer program in order to attempt to predict what panties Momiji would wear on any given day. In defence of his skills, it did work.
Yaegashi has virtually no field training whatsoever, is not terribly physically adept, is rather short sighted and nearly blind without his glasses, and on top of all else, is prone to panicking in dangerous situations.